論文 - 詳細
| RRC ID | 68534 |
|---|---|
| 著者 | Kitagawa K, Hiramatsu Y, Uchida C, Isobe T, Hattori T, Oda T, Shibata K, Nakamura S, Kikuchi A, Kitagawa M. |
| タイトル | Fbw7 promotes ubiquitin-dependent degradation of c-Myb: involvement of GSK3-mediated phosphorylation of Thr-572 in mouse c-Myb. |
| ジャーナル | Oncogene |
| Abstract |
Expression of oncoprotein c-Myb oscillates during hematopoiesis and hematological malignancies. Its quantity is not only regulated through transcriptional control but also through the ubiquitin-proteasome pathway, accompanied by phosphorylation, although the mechanisms are poorly understood. In this report, we tried to identify an E3 ubiquitin ligase, which targets c-Myb for ubiquitin-dependent degradation. We found that an F-box protein, Fbw7, interacted with c-Myb, which is mutated in numerous cancers. Fbw7 facilitated ubiquitylation and degradation of c-Myb in intact cells. Moreover, depletion of Fbw7 by RNA interference delayed turnover and increased the abundance of c-Myb in myeloid leukemia cells concomitantly, and suppressed the transcriptional level of gamma-globin, which receives transcriptional repression from c-Myb. In addition, we analysed sites required for both ubiquitylation and degradation of c-Myb. We found that Thr-572 is critical for Fbw7-mediated ubiquitylation in mouse c-Myb using site-directed mutagenesis. Fbw7 recognized the phosphorylation of Thr-572, which was mediated by glycogen synthase kinase 3 (GSK3). In consequence, the c-Myb protein was markedly stabilized by the substitution of Thr-572 to Ala. These observations suggest that SCF(Fbw7) ubiquitin ligase regulates phosphorylation-dependent degradation of c-Myb protein. |
| 巻・号 | 28(25) |
| ページ | 2393-405 |
| 公開日 | 2009-6-25 |
| DOI | 10.1038/onc.2009.111 |
| PII | onc2009111 |
| PMID | 19421138 |
| MeSH | Animals Cell Cycle Proteins / genetics Cell Cycle Proteins / metabolism* Cells, Cultured F-Box Proteins / genetics F-Box Proteins / metabolism* F-Box-WD Repeat-Containing Protein 7 Glycogen Synthase Kinase 3 / genetics Glycogen Synthase Kinase 3 / metabolism* Humans Immunoprecipitation Mice Mutagenesis, Site-Directed Phosphorylation Proto-Oncogene Proteins c-myb / metabolism* Proto-Oncogene Proteins c-myc / genetics Proto-Oncogene Proteins c-myc / metabolism RNA, Messenger / genetics RNA, Messenger / metabolism Receptor, Notch1 / genetics Receptor, Notch1 / metabolism Reverse Transcriptase Polymerase Chain Reaction Threonine / genetics Threonine / metabolism* Ubiquitin / metabolism* Ubiquitin-Protein Ligases / genetics Ubiquitin-Protein Ligases / metabolism* Ubiquitination |
| IF | 7.971 |
| オルトメトリクス指標 |
オルトメトリクス指標項目
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| 最多言及媒体 | Patent(IFI CLAIMS) |
| 各媒体での言及数の合計 | 1 |
| 過去6か月間でのオルトメトリクス指標の変動値 | 0.0 |
| リソース情報 | |
| ヒト・動物細胞 | K562(RCB0027) |